`C_(4)` plants consume _____ NADPH molecules to fix `2CO_(2)` , and `C_(3)` plants requires _____ molecules of NADPH for same amount of `CO_(2)`

Options

A. 8,8
B. 4,4
C. 8,12
D. 12,8

Answer

To solve the question regarding the consumption of NADPH molecules by C4 and C3 plants to fix 2 molecules of CO2, we can follow these steps:

### Step 1: Understand the process of photosynthesis in C4 plants
C4 plants utilize a different pathway for carbon fixation compared to C3 plants. In the C4 pathway, for every 2 molecules of CO2 fixed, the plants require 4 NADPH molecules.

### Step 2: Understand the process of photosynthesis in C3 plants
In C3 plants, during the Calvin cycle, the fixation of 1 molecule of CO2 requires 2 NADPH molecules. Therefore, for 2 molecules of CO2, the requirement will also be 4 NADPH molecules.

### Step 3: Summarize the findings
- C4 plants require **4 NADPH** molecules to fix **2 CO2**.
- C3 plants also require **4 NADPH** molecules to fix **2 CO2**.

### Final Answer
C4 plants consume **4** NADPH molecules to fix 2 CO2, and C3 plants require **4** NADPH molecules for the same amount of CO2.

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